&扇 Collaboration 1002 UNIVE 10 当Client提交一个请求时，请求沿链传递直至有 一个ConcreteHandler对象负责处理它 aCllent aConcreteHandler aHandler aConcreteHandler successor successor Sample Code Institute of Computer Software 2022-2-27 Nanjing UniversityCollaboration  当Client提交一个请求时，请求沿链传递直至有 一个ConcreteHandler对象负责处理它 2022-2-27 Institute of Computer Software Nanjing University 10 Sample Code